Accumulated Other Comprehensive Loss (Components of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (52,981)		$ (25,268)
Other comprehensive income before reclassifications	18,956		7,697
Amounts reclassified from accumulated other comprehensive (loss) income	(1,386)		977
Net current period other comprehensive income	17,570		8,674
Ending balance	(35,411)		(16,594)
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,664)	[1]	(4,434)	[1]
Other comprehensive income before reclassifications	354	[1]	441	[1]
Amounts reclassified from accumulated other comprehensive (loss) income	0	[1]	0	[1]
Net current period other comprehensive income	354	[1]	441	[1]
Ending balance	(2,310)	[1]	(3,993)	[1]
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5,098	[1]	(10,091)	[1]
Other comprehensive income before reclassifications	18,602	[1]	7,256	[1]
Amounts reclassified from accumulated other comprehensive (loss) income	(3,149)	[1]	0	[1]
Net current period other comprehensive income	15,453	[1]	7,256	[1]
Ending balance	20,551	[1]	(2,835)	[1]
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(55,415)	[1]	(10,743)	[1]
Other comprehensive income before reclassifications	0	[1]	0	[1]
Amounts reclassified from accumulated other comprehensive (loss) income	1,763	[1]	977	[1]
Net current period other comprehensive income	1,763	[1]	977	[1]
Ending balance	$ (53,652)	[1]	$ (9,766)	[1]

[1] All amounts are net of tax.